feat(seq-ql): add histogram pipe

[forshev]

Description

Added a histogram pipe to seq-ql.

With this change it's possible to request a histogram by a search query such as * | histogram 30s, no more need to fill hist object in the ComplexSearch request body

Fixes #201

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 77.58621% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.84%. Comparing base (ea417d7) to head (c83de37).

Files with missing lines	Patch %	Lines
asyncsearcher/async_searcher.go	25.00%	5 Missing and 1 partial ⚠️
parser/seqql_pipes.go	82.35%	4 Missing and 2 partials ⚠️
storeapi/grpc_search.go	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
+ Coverage   71.70%   71.84%   +0.13%     
==========================================
  Files         197      197              
  Lines       14562    14611      +49     
==========================================
+ Hits        10442    10497      +55     
+ Misses       3385     3380       -5     
+ Partials      735      734       -1     

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